SOLUTION: How do I expand {{{ (4a-2)^2 }}} ? I have the answer to the problem which is {{{16a^2-16a+4}}} but I don't know exactly how to get to that.

Algebra ->  Expressions -> SOLUTION: How do I expand {{{ (4a-2)^2 }}} ? I have the answer to the problem which is {{{16a^2-16a+4}}} but I don't know exactly how to get to that.      Log On


   

Question 1044719: How do I expand +%284a-2%29%5E2+ ?
I have the answer to the problem which is 16a%5E2-16a%2B4 but I don't know exactly how to get to that.
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
How do you WANT to expand it? Directly use Binomial Theorem formula? Directly multiply?


The "etcetera" is because the three dots will not render here.

Your square is much simpler in your example.
%284a%29%5E2%2B%284a%29%28-2%29%2B%284a%29%28-2%29%2B%28-2%29%5E2
SIMPLIFY THIS!

Answer by ikleyn(52795) About Me  (Show Source):
You can put this solution on YOUR website!
.
See the lessons
    -The square of the sum formula
in this site.

In my student years, we knew such formulas as the alphabet.